My son has used two of these malem alarms with no success.First malem alarm was model m04 and that was a problem where it would overheat when son was asleep.The heat was significant to wake him up and discontinue use.After two nights of failed use and overheating, we returned the product and upgraded to the m05 version.Same thing again; it's not the batteries because we have changed them.It's something in the product itself that is misbehaving and causing heat.You can feel it hot when you hold it in your hands.Sleeping with this alarm is not possible.
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